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EMC6D103 Datasheet(PDF) 63 Page - SMSC Corporation

Part # EMC6D103
Description  FAN CONTROL DEVICE WITH HIGH FREQUENCY PWM
PDF  89 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC6D103 Datasheet(HTML) 63 Page - SMSC Corporation

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Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Datasheet
SMSC EMC6D103
63
Revision 0.4 (04-04-05)
DATASHEET
Software uses the information in this register to determine the voltage that the processor is designed
to operate at. With this information, software can then dynamically determine the correct values to
place in the Vccp Low Limit and Vccp High Limit registers.
This register is read only – a write to this register has no effect.
8.2.12
Registers 44-4Dh: Voltage Limit Registers
Setting the Lock bit has no effect on these registers.
If a voltage input either exceeds the value set in the voltage high limit register or falls below or equals
the value set in the voltage low limit register, the corresponding bit will be set automatically by the
EMC6D103 in the interrupt status registers (41-42h). Voltages are presented in the registers at ¾ full
scale for the nominal voltage, meaning that at nominal voltage, each input will be C0h, as shown in
Table 8.20.
Table 8.19 Registers 44-4Dh: Voltage Limit Registers
Register
Address
Read/
Write
Register Name
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
Default
Value
44h
R/W
2.5V Low Limit
7
6
5
4
3
2
1
0
00h
45h
R/W
2.5V High Limit
7
6
5
4
3
2
1
0
FFh
46h
R/W
Vccp Low Limit
7
6
5
4
3
2
1
0
00h
47h
R/W
Vccp High Limit
7
6
5
4
3
2
1
0
FFh
48h
R/W
VCC Low Limit
7
6
5
4
3
2
1
0
00h
49h
R/W
VCC High Limit
7
6
5
4
3
2
1
0
FFh
4Ah
R/W
5V Low Limit
7
6
5
4
3
2
1
0
00h
4Bh
R/W
5V High Limit
7
6
5
4
3
2
1
0
FFh
4Ch
R/W
12V Low Limit
7
6
5
4
3
2
1
0
00h
4Dh
R/W
12V High Limit
7
6
5
4
3
2
1
0
FFh
Table 8.20 Voltage Limits vs. Register Setting
INPUT
NOMINAL
VOLTAGE
REGISTER
SETTING AT
NOMINAL
VOLTAGE
MAXIMUM
VOLTAGE
REGISTER
SETTING AT
MAXIMUM
VOLTAGE
MINIMUM
VOLTAGE
REGISTER
SETTING AT
MINIMUM VOLTAGE
2.5V
2.5V
C0h
3.32V
FFh
0V
00h
Vccp
2.25V
C0h
3.00V
FFh
0V
00h
VCC
3.3V
C0h
4.38V
FFh
0V
00h
5V
5.0V
C0h
6.64V
FFh
0V
00h
12V
12.0V
C0h
16.00V
FFh
0V
00h



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